GEOLOGY WITH JEFF SIMPSON
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The Long Decline of Arctic Sea Ice

1/5/2021

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Forty years of satellite data show that 2020 was just the latest in a decades-long decline of Arctic sea ice. In a review of scientific literature, polar scientists Julienne Stroeve and Dirk Notz outlined some of these changes: In addition to shrinking ice cover, melting seasons are getting longer and sea ice is losing its longevity.  The longer melting seasons are the result of increasingly earlier starts to spring melting and ever-later starts to freeze-up in autumn. The map above shows trends in the onset of freeze-up from 1979 through 2019. Averaged across the entire Arctic Ocean, freeze-up is happening about a week later per decade. That equates to nearly one month later since the start of the satellite record in 1979. - Earth Observatory / NASA
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Geologists Raise the Speed Limit for How Fast Continental Crust can Form

10/9/2020

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Scientists have thought that the Earth's mountain ranges are formed through this process over many millions of years. But MIT geologists have now found that the planet can generate new land far more quickly than previously thought. In a paper published in the journal Geology, the team shows that parts of the Sierra Nevada mountain range in California rose up surprisingly fast, over a period of just 1.39 million years—more than twice as fast as expected for the region. The researchers attribute the rapid formation of land to a massive flare-up of magma.- Phys.Org


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Meteorite Crater Discovered Drilling for Outback Gold Estimated to Be 100MY

9/25/2020

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Geologists say they have discovered a large meteorite crater in outback Western Australia, which could be up to five times bigger than the famous Wolfe Creek Crater in the state's remote north.  A team of geologists led by geological consultant Dr Jayson Meyers is behind the discovery in WA's Goldfields  Initial estimates suggest the asteroid that created the crater collided with the Earth 100 million years ago. It is not visible from the surface but electromagnetic surveys, which map the rocks below, suggest the crater has a diameter of around 5 kilometres.  - ABC (Australia)
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    Geo News

    I started a CGCC Facebook page in May of '20 to share geo-environmental news but had concerns about FB's issues with accuracy.  This page, GeoNews, is a response and partial solution, sharing a few items from reliable sources each week.  

    Click the
    source link after the included text to read more.

    To respond thoughtfully or ask questions, click "Comments". 

    To complete the extra credit option, use this Google Doc.

    Contact Prof Jeff to share items.


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